but ktvu reporter tara found the drawbacks. >> reporter: you can take it for free on the worldwide web. >> no money investment. >> reporter: he got a job with the pal alto online advertising company after he completed 6 online courses in 2 months. >> thing about tech and hearing the value, no one pays attention to the credentialing. people more interested what you can do. >> there's this big area we try to get in. >> reporter: professor keith who teaches intro to math course at stanford, says this idea of education broadcast to the masses at no charge is unchartered territory. >> i have students in my course, -- >> reporter: this quarter 62,000 people signed up for his online course. at stanford, they were offer this january and what happens next, educators are calling nothing short of a phenomenon. >> 450,000 people i think registered and signed up. >> reporter: hannah isn't sure how she feels what people getting for free since she pay top dollars for. they help placed him in a job. >> i'm thinking about a year to get something comparable. >> reporter: professor said these three class